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NOTES PAYABLE AND AMENDED CREDIT AGREEMENT - Summary of Notes Payable and Credit Agreement (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Debt Instruments [Abstract]    
Payments/Long term debt $ 35,937 $ 21,495
Less current portion (672) (4,899)
Long term portion 35,265 16,596
Credit Facility [Member]    
Debt Instruments [Abstract]    
Payments/Long term debt $ 33,000 $ 16,000
Average effective interest rate 2.60% 2.60%
3.25% through 5.50% Notes Payable due in Next Year [Member]    
Debt Instruments [Abstract]    
Payments/Long term debt $ 2,937 $ 5,495
Annual installments $ 672  
3.25% through 5.50% Notes Payable due in Next Year [Member] | Minimum [Member]    
Debt Instruments [Abstract]    
Percentage of interest accrued 3.25%  
3.25% through 5.50% Notes Payable due in Next Year [Member] | Maximum [Member]    
Debt Instruments [Abstract]    
Percentage of interest accrued 5.50%